Water pump selection method
The flow of the pump, that is, the water output, is generally not appropriate to choose too much, otherwise it will increase the cost of purchasing the pump. Should be selected according to demand, such as the self-priming pump used by the user's family, the flow should be selected as small as possible; If the user uses the submersible pump for irrigation, it can be appropriate to choose a larger flow rate.
1, to buy water pumps according to local conditions. There are three types of commonly used agricultural pumps, namely centrifugal pumps, axial flow pumps and mixed flow pumps. The centrifugal pump has high head, but little water output, which is suitable for mountainous areas and well irrigation areas. The axial flow pump has large water output, but the head is not too high, which is suitable for use in plain area. The water yield and head of the mixed flow pump are between the centrifugal pump and the axial flow pump, and are suitable for use in plain and hilly areas. Users should choose and buy according to the ground condition, water source and water lifting height.
2, to properly exceed the selection of water pump. After determining the type of pump, it is necessary to consider its economic performance, and pay special attention to the choice of the head and flow of the pump and its supporting power. It must be noted that there is a difference between the lift (total lift) indicated on the pump label and the discharge lift (actual lift) when used, which is because there is a certain resistance loss when the water flows through the water supply pipe and near the pipeline. Therefore, the actual head is generally 10%-20% lower than the total head, and the water output is correspondingly reduced. Therefore, in actual use, only according to the sign of 80% ~ 90% of the head and flow estimate, the choice of pump supporting power, can be selected according to the power indicated on the sign, in order to make the pump start quickly and use safety, the power of the engine can also be slightly greater than the required power of the pump, generally about 10% higher is appropriate; If there is power, when you buy a water pump, you can choose a matching pump according to the power of the engine.
3, to strictly purchase the pump. When purchasing, it is necessary to examine the "three certificates", that is, the agricultural machinery promotion license, the production license and the product inspection certificate, and only the three certificates can avoid the purchase of eliminated products and inferior products.
Number selection
1, for the normal operation of the pump, generally only one, because a large pump is equivalent to two small pumps working in parallel, (referring to the same head and flow), the efficiency of the large pump is higher than that of the small pump, so from the perspective of energy saving, it is better to choose a large pump, rather than two small pumps, but in the case of the following situations, two pumps can be considered in parallel cooperation: the flow is large, a pump can not reach this flow.
2, for large pumps that need to have a 50% reserve rate, two smaller pumps can be changed to work, two standby (a total of four)
3, for some large pumps, 70% of the flow requirements of the pump can be used in parallel operation, without a spare pump, in a pump maintenance, the other pump is still responsible for 70% of the production of transport.
4, for the pump that needs 24 hours of continuous operation, three pumps should be used, one operation, one standby, and one maintenance.
Distinguish between true and false
First, the product packaging of the original pump or supporting manufacturers is generally standardized, the handwriting is clear and regular, and there are detailed product names, specifications and models, registered trademarks, factory names, factory addresses and phone numbers; The general packaging of counterfeit accessories is rough, and the factory address and name are not clear.
Second, the qualified water pump surface is smooth and good workmanship. The more important the parts, the higher the processing precision, the more stringent the packaging rust prevention and corrosion prevention. When purchasing, if the parts are found to have rust spots or rubber parts cracked, lost elasticity or the journal surface has bright processing lines, it should not be the original parts.
Third, the appearance of inferior pumps is sometimes good. However, due to the poor production process, it is easy to be damaged, when buying, as long as the side, corner and other hidden parts of the accessories, you can see the quality of the accessories process.
Fourth, some pumps are refurbished waste parts, then as long as the accessories surface paint can be found after the old paint, such a pump is best not to use.
Fifth, the parts bought are installed on the car, depending on whether it can be and it has a good combination of accessories. Generally, the original parts can be well rationed to the car, and the inferior parts are difficult to cooperate with each other because of the poor process and the large processing error.
Sixth, in order to ensure that the assembly relationship of the pump meets the technical requirements, some regular parts are engraved with assembly marks to ensure the correct installation of accessories, if there is no mark or vague mark can not be identified, it is not qualified accessories.
Seventh, the regular pump assembly and components must be intact to ensure smooth loading and normal operation. Some of the small parts on the assembly are missing, it is easy to start loading the car to cause difficulties, such parts may be counterfeit parts.
Eighth, some important accessories, especially the assembly class, generally with instructions, certificates, in order to guide users to install, use and maintenance, counterfeit assembly generally will not have detailed installation instructions to guide these.
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